One huge point of RSC is that you can use your super heavyweight library in the backend, and then not send a single byte of it to the frontend, you just send it

One huge point of RSC is that you can use your super heavyweight library in the backend, and then not send a single byte of it to the frontend, you just send its output. It's a huge win in the name of shaving way more than ms from your page. One example a programmer might understand - rather than needing to send the grammar and code of a syntax highlighter to the frontend to render formatted code samples, you can keep that on the backend, and just send the resulting HTML/CSS to the frontend, by making sure that you use your syntax highlighter in a server component instead of a client component. All in the same language and idioms that you would be using in the frontend, with almost 0 boilerplate. And if for some reason you decide you want to ship that to the frontend, maybe because you want a user to be able to syntax highlight code they type into the browser, just make that component be a client component instead of a server component, et voila, you've achieved it with almost no code changes. Imagine what work that would take if your syntax highlighter was written in Go instead of JS.